Brake-band-servicing machine



June 1929- G. E. WEAVER ET AL BRAKE BAND SERVICING MACHINE Filed July 25, 1927 2 Sheets-Sheet l 'June 11, 1929. G. E. WEAVER ET AL 1,717,130

BRAKE BAND SERVICING MACHINE Filed July 25, 1927 2 Sheets-Sheet 2 IA. i I

Patented. 51.3216 11, 1929.

UNITED STATES PATENT OFFICE.

GAILLRD E. WEAVER AND HARRY C. BUIFING'ION, OF SPRINGFIELD, ILLINOIS, AS-

SIGNOBS TO WEAVER MANUFACTURING COMPANY, 01 SPRINGFIELD, ILLINOIS, A

CORPORATION OF ILLINOIS.

BBAKE-BLND-SEBVICING MACHINE.

Application filed July 25, 1927. Serial No. 208,211.

The'present invention pertains to betterments in the means for applying linings to the brake-bands of vehicles, facings to disc clutches, friction-fabric coverings for transmission-bands, etc.

Its main object is to supply simple means which will most etfectively and securely fasten such linings to brake-bands, for example. and, whereby the fabric of the lining will be injured or marred in the least degree and the rivets applied so that they will hold the lining most advantageously.

Extended experience has shown that a die, having an upstanding. circular. sharp-edged rib or flange which will, in small degree, cut or press into the fabric and prevent its bulging, coupled with a punch having a conical point, will produce the best results in punching out some of the fabric to provide the hole for the reception of the rivet and in countersinking and condensing the fabric beneath the rivet-head. whereby the strength of the full body or thickness of the fabric is retained. and the hole through the lining for the rivet is such that the latter may be readily inserted and maintained in correct position during the rivet heading or upsetting operation.

To permit those trained in this art to comprehend the invention and its relation to preceding practices. in the accompanying drawings. forming a art of this specification, and throughout the several views of which like reference numerals have been emploved to denote the same structural parts. a preferred embodiment of the invention has been depicted and the obiectionable characteristics of earlier work presentedpictoriallv, in order that by the contrast, the advantages accruing from the use of the invention may be made clearlv apparent.

In this drawing:

Figure 1 illustrates in section the earlier style of punch and die used to force out the piece of lining in register with the hole in the metal brake-band;

Figure 2 shows in section the results produced by such an appliance and indicates the which will engage the associated bake-drum not illustrated;

Figure 5 illustrates in similar manner the pointed punch and the sharp-ribbed die of the present invention;

Figure 6 shows the result of such punching operation;

Figure 7 indicates the rivet inserted in place and ready to be headed;

Figure 8 presents the final work;

Figures 9 and 10 illustrate the fabric punch ng and compressing operations on a larger scale.

Referring first to the illustrations of Figures 1 to 4 inclusive. the brake-band, only a fragment of which is shown, has been characterized 11 and its associated portion of fabric lining has been designated 12. the blunt or straight end punch 13 cooperating with a flat-ended die 14 of usual formation.

Such a construction will punch or force out a plug (not shown) of the lining, but the hole 15 formed thereby in the lining will be rough ragged. and fraved. as shown in Figure 2. making it difficult to insert the unheaded rivet 16. the protruding irregular ends of the little copper wires. used in the lining material to bind it together, projecting into the aperture and hence impeding an which contacts with the brake-drum, not indicated, and hence lessens the efiective work of the lining in producing the required resistance or friction.

In contrast to the foregoing, the resent invention involves the use of a conically pointed punch 113 and an associated or complementary die 114 having a sloping surface or shoulder-120 from the center of which rises a round pro'ection 121 provided around its margin wit a sharp-edged flange or rib 122, the outside diameter of which is slightly greater than that of the head of the rivet to be used.

When such punch descends through the hole in the brake-band 111, due to its pointed end, it assures alignment of the apertures of the band and die, and, although it has a piercing action on the linin fabric 112, it cuts out and forces ahead of it a piece of the lining, but, due to its conical end, it compresses the fabric around it outwardly, while it is also maintained from bulging by the confining sharp-edged rib or flange 122, with the result that the hole produced in the linin is much smoother than it has been hereto f ore possible to accomplish. (See Figures 9 and 10.)

As the punchcontinuesits descent, its shoulder 110 presses on the top face of the band .causing the underlying lining to be counter sunk around the hole by compressing and condensing the fabric by reason of the projection 121 being forced into it and squeezing the fabric between itself and the under surface of the band, bulging or lateral expansion of such fabric during this action being-prevented by the transverse confining and restraining action of the rib or flange on the fabric into which it is somewhat embedded, it being observed that the outer surface of the projection is cylindrical, whereas its inner surface is sloping, which aids or enhances the binding or non-spreading function which it performs.

The exact amount or extent of countersink is easily accomplished because when the sloping die surface or shoulder 120 engages the inner face of the lining it limits the degree to which the boss or projection can be forced into the lining during the countersinking action.

The work accomplished by such a plunger and die is shown in Figure 6 wherein the hole 115 is smooth and the countersink 123 is of the form depicted.

A-rivet116 is easily introduced into such a smoothwalled aperture and its head readily seats itself in correct position, so that when the end of the rivet is headed over as specified in Figure 7 the resulting product, as presented in Figure 8 will be quite satisfactory.

Inasmuch as the full thickness of the lining is under the rivet head, although condensed and compressed, an unusually strong holding or fastening is obtained, and, since all danger 'tial lateral distortion.

like, the combination of a reciprocatory punch adapted to be projected through an aperture of the band and to be forced through the lining to be secured thereto, a compan on countersinking die larger in cross-section than and apertured to receive said punch, said die having projectin means on that portion of its surface whichiears on said lining and which is designed to be forced into said lining during the countersinking operation to prevent substantial movement of the lining on said surface thus precluding material lateral distortion of the lining.

2. In an appliance for securing compressible linings to vehicle brake-bands and the like, the combination of a reciprocatory punch adapted to be projected through an aperture of the band andvto be forced through the lining to be secured thereto, a companion countersinking die larger in cross section than and apertured to receive said punch, said die having a peripheral rib on its surface which bears on said lining and which is designed to be forced into said lining during the countersinking operation to prevent substantial movement of the lining on said surface thus precluding material lateral distortion of the lining.

3. In an appliance for securing compressible linings to vehicle brake-bands and the like, the combination of a reciprocatory shouldered punch having a pointed and adapted to be projected through an aperture of the band and to be forced through the lining to be secured thereto, and a companion shouldered die having a countersinking proectlon provided around its periphery with a sharp-edged rib, said die projection being forced into the lining, after the unch should er engages the band, to provi e a counters1nk recess in the lining the depth of which 1s determined by the height of said projecs t1o n beyond the die shoulder,.said rib confining that portion of the lining undergoing the counter-sinking action against substan- 4. In an appliance for securing compressible linings to vehicle brake-bands and the like, the combination of a reciprocatory shouldered punch having a pointed end adapted to be projected through an aperture of the band and to be forced through the lining to be secured thereto, and a companion shouldered die havin a countersinking projection tion beyond the die shoulder, said rib conprovided around its periphery with a sharpfining that portion of the lining undergoin g edged rib cylindrical on its outerside and the countersinking action against substantia sloping on its inside, said die projection being lateral distortion.

5 forced into the lining, after the punch shoul-' In witness whereof we have hereunto set der engages the band, to provide a counterour hands. sink recess in the'lining the de th of which GAILARD E. WEAVER. is determined by the height 0 said projecs HARRY C. BUFFINGTON. 

